package com.atguigu.gulimall.order.service.impl;

import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.exception.NoStockException;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;
import com.atguigu.common.utils.R;
import com.atguigu.common.vo.MemberRespVo;
import com.atguigu.gulimall.order.constant.OrderConstant;
import com.atguigu.gulimall.order.dao.OrderDao;
import com.atguigu.gulimall.order.entity.OrderEntity;
import com.atguigu.gulimall.order.entity.OrderItemEntity;
import com.atguigu.gulimall.order.enume.OrderStatusEnum;
import com.atguigu.gulimall.order.feign.CartFeignService;
import com.atguigu.gulimall.order.feign.MemberFeignService;
import com.atguigu.gulimall.order.feign.ProductFeignService;
import com.atguigu.gulimall.order.feign.WmsFeignService;
import com.atguigu.gulimall.order.interceptor.LoginUserInterceptor;
import com.atguigu.gulimall.order.service.OrderItemService;
import com.atguigu.gulimall.order.service.OrderService;
import com.atguigu.gulimall.order.to.OrderCreateTo;
import com.atguigu.gulimall.order.vo.*;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.core.toolkit.IdWorker;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.core.script.DefaultRedisScript;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.StringUtils;
import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.context.request.RequestContextHolder;

import java.math.BigDecimal;
import java.util.*;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.stream.Collectors;


@Service("orderService")
public class OrderServiceImpl extends ServiceImpl<OrderDao, OrderEntity> implements OrderService {
    private ThreadLocal<OrderSubmitVo> confirmVOThreadLocal = new ThreadLocal<>();

    @Autowired
    OrderItemService orderItemService;

    @Autowired
    MemberFeignService memberFeignService;

    @Autowired
    CartFeignService cartFeignService;

    @Autowired
    ThreadPoolExecutor executor;

    @Autowired
    WmsFeignService wmsFeignService;

    @Autowired
    StringRedisTemplate redisTemplate;

    @Autowired
    ProductFeignService productFeignService;

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<OrderEntity> page = this.page(
                new Query<OrderEntity>().getPage(params),
                new QueryWrapper<OrderEntity>()
        );

        return new PageUtils(page);
    }

    /**
     * 订单确认页返回需要的数据
     * @return
     */
    @Override
    public OrderConfirmVO confirmOder() throws ExecutionException, InterruptedException {
        OrderConfirmVO confirmVO = new OrderConfirmVO();
        MemberRespVo memberRespVo = LoginUserInterceptor.loginUser.get();
        RequestAttributes requestAttributes = RequestContextHolder.getRequestAttributes();

        CompletableFuture<Void> getAddressFuture = CompletableFuture.runAsync(() -> {
            //远程获取当前用户的所有收货地址
            //线程间共享数据
            RequestContextHolder.setRequestAttributes(requestAttributes);
            List<MemberAddressVo> address = memberFeignService.getAddress(memberRespVo.getId());
            confirmVO.setAddress(address);
        }, executor);

        CompletableFuture<Void> cartFuture = CompletableFuture.runAsync(() -> {
            //远程查询购物车所有选中的购物项
            RequestContextHolder.setRequestAttributes(requestAttributes);
            List<OrderItemVo> currentUserCartItems = cartFeignService.getCurrentUserCartItems();
            confirmVO.setOrderItems(currentUserCartItems);
        }, executor).thenRunAsync(() -> {
            List<OrderItemVo> items = confirmVO.getOrderItems();
            List<Long> collect = items.stream().map(item -> item.getSkuId()).collect(Collectors.toList());
            R r = wmsFeignService.getSkusHasStock(collect);
            List<SkuStockVo> data = r.getData("data", new TypeReference<List<SkuStockVo>>() {
            });
            if(data != null) {
                Map<Long, Boolean> map = data.stream().collect(Collectors.toMap(SkuStockVo::getSkuId, SkuStockVo::getHasStock));
                confirmVO.setStocks(map);
            }
        }, executor);

        Integer integration = memberRespVo.getIntegration();
        confirmVO.setIntegration(integration);

        //防重令牌
        String token = UUID.randomUUID().toString().replace("-", "");
        redisTemplate.opsForValue().set(OrderConstant.USER_ORDER_TOKEN_PREFIX+memberRespVo.getId(), token, 30, TimeUnit.MINUTES);
        confirmVO.setOrderToken(token);

        CompletableFuture.allOf(getAddressFuture, cartFuture).get();
        return confirmVO;
    }

    /**
     * 下单
     * @param vo
     * @return
     */
    @Transactional
    @Override
    public SubmitOrderResponseVo submitOrder(OrderSubmitVo vo) {
        confirmVOThreadLocal.set(vo);
        SubmitOrderResponseVo response = new SubmitOrderResponseVo();
        MemberRespVo memberRespVo = LoginUserInterceptor.loginUser.get();
        response.setCode(0);

        //验证令牌【令牌的对比和删除必须保持原子性】
        String script = "if redis.call('get', KEYS[1]) == ARGV[1] then return redis.call('del', KEYS[1]) else return 0 end";
        String orderToken = vo.getOrderToken();
        //原子验证令牌，和删除令牌
        Long result = redisTemplate.execute(new DefaultRedisScript<Long>(script, Long.class), Arrays.asList(OrderConstant.USER_ORDER_TOKEN_PREFIX + memberRespVo.getId()), orderToken);
        if(result == 0) {
            response.setCode(1);
            return response;
        } else {
            //令牌验证成功
            //去创建订单，验令牌，验价格，锁库存...
            OrderCreateTo order = createOrder();
            BigDecimal payAmount = order.getOrder().getPayAmount();
            BigDecimal payPrice = vo.getPayPrice();

            if (Math.abs(payAmount.subtract(payPrice).doubleValue()) < 0.01){
                //保存订单
                saveOrder(order);
                //锁定库存,只要有异常回滚订单数据
                WareSkuLockVo lockVo = new WareSkuLockVo();
                lockVo.setOrderSn(order.getOrder().getOrderSn());
                List<OrderItemVo> locks = order.getOrderItems().stream().map(item -> {
                    OrderItemVo itemVo = new OrderItemVo();
                    itemVo.setSkuId(item.getSkuId());
                    itemVo.setCount(item.getSkuQuantity());
                    itemVo.setTitle(item.getSkuName());
                    return itemVo;
                }).collect(Collectors.toList());
                lockVo.setLocks(locks);
                //TODO 远程锁库存
                R r = wmsFeignService.orderLockStock(lockVo);
                if(r.getCode() == 0) {
                    //锁定成功
                    response.setOrder(order.getOrder());
                    return response;
                } else {
                    //锁定失败
                    String msg = (String) r.get("msg");
                    throw new NoStockException(msg);
//                    response.setCode(3);
//                    return response;
                }
            } else {
                response.setCode(2);
                return response;
            }

        }

//        String redisToken = redisTemplate.opsForValue().get(OrderConstant.USER_ORDER_TOKEN_PREFIX + memberRespVo.getId());
//        if(redisToken != null && orderToken.equals(redisToken)) {
//            //令牌验证通过，
//            redisTemplate.delete(OrderConstant.USER_ORDER_TOKEN_PREFIX + memberRespVo.getId());
//            return null;
//        } else {
//            //不通过
//            return null;
//        }
    }

    private void saveOrder(OrderCreateTo order) {
        OrderEntity orderEntity = order.getOrder();
        orderEntity.setModifyTime(new Date());
        this.save(orderEntity);

        List<OrderItemEntity> orderItemEntities = order.getOrderItems();
        orderItemService.saveBatch(orderItemEntities);

    }

    private OrderCreateTo createOrder () {
        OrderSubmitVo submitVo = confirmVOThreadLocal.get();
        OrderCreateTo createTo = new OrderCreateTo();

        //生成订单号并构建订单
        String orderSn = IdWorker.getTimeId();
        OrderEntity orderEntity = buildOrder(submitVo, orderSn);

        //获取到所有的订单项
        List<OrderItemEntity> itemEntities = buildOrderItems(orderSn);

        //计算价格相关
        computerPrice(orderEntity, itemEntities);

        createTo.setOrder(orderEntity);
        createTo.setOrderItems(itemEntities);

        return createTo;
    }

    /**
     * 订单价格相关
     * @param orderEntity
     * @param itemEntities
     */
    private void computerPrice(OrderEntity orderEntity, List<OrderItemEntity> itemEntities) {
        BigDecimal total = new BigDecimal("0.0");

        //订单项的订单总额
        BigDecimal coupon = new BigDecimal("0.0");
        BigDecimal integration = new BigDecimal("0.0");
        BigDecimal promotion = new BigDecimal("0.0");
        BigDecimal gift = new BigDecimal("0.0");
        BigDecimal growth = new BigDecimal("0.0");

        for (OrderItemEntity entity : itemEntities) {
            coupon = coupon.add(entity.getCouponAmount());
            integration = integration.add(entity.getIntegrationAmount());
            promotion =promotion.add(entity.getPromotionAmount());
            total = total.add(entity.getRealAmount());
            gift = gift.add(new BigDecimal(entity.getGiftIntegration().toString()));
            growth = growth.add(new BigDecimal(entity.getGiftGrowth().toString()));

        }
        orderEntity.setTotalAmount(total);
        //应付总额
        orderEntity.setPayAmount(total.add(orderEntity.getFreightAmount()));
        orderEntity.setPromotionAmount(promotion);
        orderEntity.setIntegrationAmount(integration);
        orderEntity.setCouponAmount(coupon);

        //设置积分信息
        orderEntity.setIntegration(gift.intValue());
        orderEntity.setGrowth(growth.intValue());
        orderEntity.setDeleteStatus(0); //未删除
    }

    /**
     * 构建订单
     * @param submitVo
     * @param orderSn
     */
    private OrderEntity buildOrder(OrderSubmitVo submitVo, String orderSn) {
        MemberRespVo memberRespVo = LoginUserInterceptor.loginUser.get();
        OrderEntity entity = new OrderEntity();
        entity.setOrderSn(orderSn);
        entity.setMemberId(memberRespVo.getId());
        //获取收货地址
        R fare = wmsFeignService.getFare(submitVo.getAddrId());
        FareVo fareResp = fare.getData(new TypeReference<FareVo>() {
        });
        //设置运费
        entity.setFreightAmount(fareResp.getFare());
        //        设置收货人信息
        entity.setReceiverCity(fareResp.getAddress().getCity());
        entity.setReceiverName(fareResp.getAddress().getName());
        entity.setReceiverPhone(fareResp.getAddress().getPhone());
        entity.setReceiverPostCode(fareResp.getAddress().getPostCode());
        entity.setReceiverProvince(fareResp.getAddress().getProvince());
        entity.setReceiverRegion(fareResp.getAddress().getRegion());

        //设置订单的相关状态信息
        entity.setStatus(OrderStatusEnum.CREATE_NEW.getCode());
        entity.setAutoConfirmDay(7);


        return entity;
    }

    /**
     * 构建订单项目
     * @return
     */
    private List<OrderItemEntity> buildOrderItems(String orderSn) {
        List<OrderItemVo> currentUserCartItems = cartFeignService.getCurrentUserCartItems();
        if(currentUserCartItems!=null && currentUserCartItems.size() > 0) {
            List<OrderItemEntity> itemEntities = currentUserCartItems.stream().map(cartItem -> {
                OrderItemEntity itemEntity = buildOrderItem(cartItem);
                itemEntity.setOrderSn(orderSn);
                return itemEntity;
            }).collect(Collectors.toList());
            return itemEntities;
        }
        return null;
    }

    /**
     * 构建每一个订单项
     * @param cartItem
     * @return
     */
    private OrderItemEntity buildOrderItem(OrderItemVo cartItem) {
        OrderItemEntity itemEntity = new OrderItemEntity();
        //1.订单信息：订单号
        //2、商品的spu信息
        Long skuId = cartItem.getSkuId();
        R r = productFeignService.getSpuInfoBySkuId(skuId);
        SpuInfoVo data = r.getData(new TypeReference<SpuInfoVo>() {
        });
        itemEntity.setSpuId(data.getId());
        itemEntity.setSpuBrand(data.getBrandId().toString());
        itemEntity.setSpuName(data.getSpuName());
        itemEntity.setCategoryId(data.getCatalogId());

        //3、商品的sku信息
        itemEntity.setSkuId(cartItem.getSkuId());
        itemEntity.setSpuName(cartItem.getTitle());
        itemEntity.setSkuPic(cartItem.getImage());
        itemEntity.setSkuPrice(cartItem.getPrice());
        String skuAttr = StringUtils.collectionToDelimitedString(cartItem.getSkuAttr(), ";");
        itemEntity.setSkuAttrsVals(skuAttr);
        itemEntity.setSkuQuantity(cartItem.getCount());
        //4、优惠信息
        //5、积分信息
        itemEntity.setGiftGrowth(cartItem.getPrice().multiply(new BigDecimal(cartItem.getCount().toString())).intValue());
        itemEntity.setGiftIntegration(cartItem.getPrice().multiply(new BigDecimal(cartItem.getCount().toString())).intValue());
        //6、订单项的价格信息
        itemEntity.setPromotionAmount(new BigDecimal("0.0"));
        itemEntity.setCouponAmount(new BigDecimal("0"));
        itemEntity.setIntegrationAmount(new BigDecimal("0"));
        //当前订单项的实际金额
        BigDecimal orign = itemEntity.getSkuPrice().multiply(new BigDecimal(itemEntity.getSkuQuantity().toString()));
        BigDecimal subtract = orign.subtract(itemEntity.getCouponAmount()).subtract(itemEntity.getPromotionAmount()).subtract(itemEntity.getIntegrationAmount());
        itemEntity.setRealAmount(subtract);

        return itemEntity;
    }

}